Paper drilling machine or the like



May 6, 1952 J ADRlAN 2,595,438

PAPER DRILLING MACHINE OR THE LIKE Filed Sept. 30, 1948 4 Sheets-Sheet lINVENTOR.

BY LAM m ATZ'K May 6, 1952 J. ADRIAN 2,595,438

PAPER DRILLING MACHINE OR THE LIKE Filed Sept. 50, 1948 4 Sheets-Sheet 2(g eam! IN V EN TOR.

Y AW UA v0 ATTYJ.

y 1952 J. ADRIAN PAPER DRILLING MACHINE OR THE LIKE 4 Sheets-Sheei 3Filed Sept. 50, 1948 INVENTOR.

KAMJ/ FOlA mwvu y 6, 1952 J. ADRIAN 2,395,438

' PAPER DRILLING MACHINE OR THE LIKE Filed Sept. 30, 1948 '4Sheets-Sheet 4 IN VEN T OR.

I08 BY E 2 A ATTY5 Patented May 6, 1952 UNITED STATES PATENT OFFICEPAPER DRILLING MACHINE OR THE LIKE Joseph Adrian, Cleveland, Ohio,assignor to Super Speed Printing Machinery, Inc., Cleveland, Ohio, acorporation of Ohio Application September 30, 1948, Serial No. 52,019

9 Claims.

This invention relates to power operated drilling machines, and moreparticularly to power operated paper drilling machines that are used fordrilling holes through stacks of paper sheets.

In power operated paper drilling machines, a head that rotatablysupports a spindle to which a hollow drill is connected is movable in avertical direction toward and from a table on which the work issupported; and it is the primary purpose of my invention to simplify theconstruction and lower the cost of machines of this kind byincorporating, in the head of the machine, not only the mechanism for,operating the drill spindle, as heretofore, but also the means formoving the head toward the table in order to force the drill through thework. Thus, all working parts of the machine (excepting a pedal that isused in the present embodiment of the invention for initiating eachcycle of operation) are capable of being incorporated in an assemblythat terminates at its lower end in a base immediately adjacent thetable of the machine, and which assembly is mounted on a stand orcabinet of suitable height.

Another object of the invention is to operate the means for moving thehead of the machine toward the table by the same prime mover that drivesthe drill spindle, and, preferably, to transmit the power from the primemover to said means through the intervention of the spindle. The obviousadvantage in such an arrangement is that, in case the rotation of thedrill is obstructed, the operation of the head moving means will besimultaneously arrested thereby to relieve parts of the machine fromundue strain or breakage.

Another object is to incorporate hydraulic means in the head of themachine for depressing the head." Another and related object is to makethe head of the machine of such form that it will provide a leak-proofreservoir for the liquid used in the hydraulic means, and tolocate allparts of said means and the connections through which they communicateinside the reservoir so that in case any leak occurs in said parts orconnections the escaping liquid will be confined to the reservoir.

Another object is to provide operative connections between the pedal(located adjacent the bottom of the stand or cabinet) and the operatingmeans (situated in the head of the machine) that will yield readily tothe vertical movements of the head and will remain operative at alltimes notwithstanding the variable spacing between th pedal and thehead.

A further object of the invention is to incorporate eilicient, smoothlyoperating and durable hydraulic means in the head of a machine of theclass aforesaid for depressing the head, and that includes a safetyfeature for protecting the drill or other parts of the machine againstbreakage or injury under abnormal operating conditions.

An additional object related to the immediately foregoing one is toprovide actuating mechanism for the hydraulic means which may beinstantly released at any point in the descent of the head thereby tostop such descent and permit the re turn of the head to normal position.

A still further object is to provide an actuator valve for the hydraulicmeans that is of very sturdy construction, and that is thoroughlyreli-'- able.

The actuator valve above refered to comprises a tubular stem havingrelief ports, and a valve memler in the form of a sleeve that isslidable along the stem to cov, r and uncover the ports; and it is afurther 0 ect of the invention to provide means for equalizing the fluidpressure exerted on the interior of the sleeve throughout thecircumference and length thereof so as to insure freedom of movement ofthe sleeve upon the stem. By virtue of this means, and in furtherance ofthe same end, a film of oil is maintained throughout the area betweenthe sleeve and stem, imparting to the sleeve a sort of floating action.

Another object is to provide dependable trip mechanism for the actuatorvalve, including an adjustable stop that is especially convenient ofmanipulation, for causing the valve to operate so as to stop thehydraulic means when the head has descended far enough to insureprojection of the drill through the work, but with minimum penertrationof the drill block.

The foregoing objects, with others that will" appear as this descriptionproceeds, are attained in the embodiment of the invention illustrated inthe accompanying drawings, wherein like reference characters designatelike parts in the several views; and while I shall describe saidembodiment in detail, I wish it to be understod that the omitted; Fig. 3is a sectional plan view of the head of the machine, the plane ofsection being indicated by the line 33 of Fig. 4; Fig. 4 is a sideelevational view in the immediate vicinity of the head of the machine,the head being partly in section, as indicated by the line 4-4 of Fig.3; Fig. 5 is'an. enlarged .transverse vertical section through the headof the machine. on the line 55 of Fig. 3; Fig. 6 is a vertical sectionthrough the actuator valve of the hydraulic means, the

section being on the line 6-6.. of Fig. 5, and Fig. 7 is an enlarged'fragmentary view-of the valve stem in the region of the escape.ports..thereof l is a stand or cabinet that.;is.desirably con--structed of sheet metal reinforced by structural.

elements in accordance with. commonpractice.

The front of the cabinet is closed partwaydown" from its upper end by apanel 2, and suitably,

supported within the cabinet, for convenient removaltherefrom, is .asol-called chip.box.3 that is provided with a frontaplate ithat closesthe front ofzthe-cabinetbelow.thepanel 2 to within a. suitflange: l2.surroundsrthe top. of the cabinet, and. secured. thereto, by fasteningmeans. [3, are the.

front arm [4 and lateral arms l5 of a base designated. generally by the.reference. numeral. 29. Risingfrom therean of. the; base. atthe.transverseecenterthereof, andhaving its lower end.

rigidly secured to. the base, is a-.cylindrical.c.olumn.-22', shownastubular? A.-table:24 is. suitably fastened to. the, base .20

and overlies. the, front portion .of. the. stand. or, cabinet -I.- and.projects a distancebeyond eachv side andthefront thereof. Removablycontained within an opening in. the .table 2.4. is the usualcircular'drillyblock 21, the opening, being so re.- latedtdthe-drillthat the latter engages .theblock. eccentricallythereof.Surmounting,thetableand clampedthereto. isthecustomary back. gauge 38,and-:along; .one; end. portion. thereofis adjustable aside gauge 3| 3.5.designates, generally, the, machine. head; This-head desirablyconsistsof acasting having a-bottom wall-and sidewalls3l andl38. Therear end of the head. is. formed by a relatively large verticalsleeve-All which isislidable upon the before-mentioned column22. Attheir. forward ends, theside walls3l and..38.converge. and joinasmaller. vertical sleeve. 42. Anti-friction bearings 43'and'44- areshown as seated withincounterbores in theupperand lower ends ofthesleeve 42. and rotatably support the. drill spindle .45 axially of saidsleeve.. Grooved pulleys. 4? and 48. are fastened tothedrillspindleabove the hearing 43. As .iscustomary inpaper drillingmachines, thelower. end of the spindle has a hollowenlargementifi,provided withone or more side openings, oneof. which is.shown. at 5| in Fig. 4. Below saidlenlargement. is the usual drill chuck53 forv connecting a hollow drill to the spindle. Sucha drillis shown inFigsl and 2, where it is designated. H6. The bore of the chuck opensinto the hollow enlargement 59 so that chips from the drill may ascendinto said enlargement and be discharged therefrom by centrifugal forcethrough the opening or openings 5| into an annular chamber of a chiphousing 55. This housing has a spout-like rearward extension 56 by whichthe chips are directed into a jointed chip chute 51 (Fig. 1) that leadsdownwardly through an openingin the table24anddrops the chips into thechip box. 3..

Shown as integral with the head 35, and as located at about thetransverse center thereof. immediately in front of the sleeve 40, is acylinder casing 60, thebore of which opens through the.top.of.thecasing- Operating within the bore of .the. cylinder.v casing is apiston 62 that may consist-of a-.solidbar of metal that is reduced indiameter at its upper end to provide a stud 83.

denotes a beam having a portion that extendsdiametrically through thecolumn 22 ad" jacent the upper end of the latter, said portion beingprovided with cylindrical parts that. fit tightly Within apertures ofthe. column to "rigidly connect the beam to thecolumn. The rectangularfront end portion'of the beam 85 hasa vertical borethatis.'occupiedby'the aforesaid stud B3 ofithe. piston. A pin 68 isshown as projected through a transverse hole in theupper end of thestud63 to lock'thebeamand piston together.

Forwardly of thebore'that receives-the stud 63,v

the'beam 65 is 'provided with' avertical, threaded aperture Within whichan adjustingscrew' I0 0perates; thescrew'beingprovided with aknob 1|atits upper end: A threaded-,axial recessopens through thelower endofthe' adjusting-screw into which. is screwed the threadediupp er endof" atrip rodll'3; Alock nut Hon said trip'rod engages;theendoftheadjusting screw'to bind the parts togetherwhen.onceproperlyadjusted. The

lower;end oftherod13carriesa trip; stop 15. To

oppose; rotation ofjthe adjusting screw H3- and thus hold it againstturning as'a resultof vibration ofithe'machine'orother. accidentalcause, I

employ means including a friction block 11, of'

fiber or thelike, which occupies a bore 18 that opens through the frontof. the beam, 65-and into the'threaded aperture that is occupied bythescrewlll'; Saidiblockis'forced" against the screw by a spring, 19"thatis compressed between said blockand aplugBO'that isthreaded into thefront end'ofthebore I81, The'trip'rod 13 passes freely P through a holein a lug that extends forwardly from'theupper. end of thecylinder casing60 and supports a cusliion ,86 which, in the present instance; consistsofia washer; of shock absorbing material, such as leather or rubber,that surroundsthe triprod.

A relatively stiff helical spring 88. surrounds the column 22 andiscompressed between the base ZUandthe. bottom of. the head 35. Thisso-called return spring, tends to hold the head in ele-'vated;position,,with the cushion 86 engaged with the nut".

A passage 90 extends-laterally from the bottom of the 'boreof' thecylindercasing' 60 through a thickened part 36 of' the bottom wall ofthe machine head; and communicating therewith is the tubular stem 9'! ofan actuator valve, designated generally by the reference numeral 92. Thelower end of said stem is threadedly connected to the part 36% andinto'the lower end of the bore of'the valve stem is screwed a plug 94having an axial aperture for a purpose presently to appear. The valvestem has an enlargement 95 about midway between itsends, andintermediate said enlargement in the lower end of the stem, the

" latter is provided with radial relief ports 96. 91

is'a sleeve-like valve member that is slidably fitted to the stem, andit is normally held in elevated position against the enlargement 95 by aspring 98 that surrounds the lower end of the stem and is compressedbetween the valve member and the part 36*. To insure freedom of movementof the valve member along the stem, the stem is provided with a seriesof circumferential grooves 99 that extend a distance above and below andthrough the zone of the relief ports 96, the character of the groovesbest appearing from the enlarged detail of Fig. 7. The presence of thesegrooves causes a film of oil to be maintained between the adjacentsurfaces of the valve member and stem, imparting to said member a sortof floating action as it moves along the stem, and moreover the grooveseifect an equalization of pressure of the liquid against the innersurface of the valve member circumferentially and lengthwise of themember. Experience has shown that, in the absence of the grooves, theoutward pressure of the liquid on the inner surface of the valve member,when the latter covers the relief ports 96, distorts the valve memberenough to result in the latters binding on the stem. The factorscontributing to this condi- 7 side of said arm IOI and a boss I06 thatprojects from the side wall 31 a distance below the notch I02. Thisspring surrounds a pull wire I08 that has its upper end locked within ahole in the arm IOI'by a set screw I09, while the lower end of said pullwire I08 is connected at II 0 (Fig. l) to the previously mentioned pedalI0. Enclosing all but the end portions of the pull wire is a flexiblecasing II2, which has its upper end extended through an aperture of theboss I 06, wherein it is locked by a set screw I I4, and its lower endfastened in a bracket II 5 that is attached to a' part of the stand orcabinet I directly above the connection between the lower end of thepull wir and pedal, by a bolt II6. I A relatively short rock shaft I20is pivoted intermediate its ends in an 'apertured lug- IZI of the sleeveI00, that is substantially opposite the arm IOI. Fastened within atransverse bore of th'eshaft I20 by a set screw I22, rearwardly of thelug I2I, is the upper end of a trip rod I 23, the lower end of which isarranged for engagement with the top of the valve member 91, as bestshown in Fig. 5. Similarly connected to the front end of the shaft I20,by a set screw I25, is a trip arm I26. Its endremote from the shaft I20is turned down and disposed in the path of the beforementioned trip stop15 on the lower end of the rod 13. A spring I28 is coiled about theshaft I20, forwardly of the lug I2I, and has one ofits ends hooked aboutsaid lug, as shown in Figs 3 and 5, and its opposite end hooked over thetrip arm I26, as shown in theaforesaid views, as well as in Fig. 4. Thisspring is so disposed as to rock the assembly including the trip armI26, shaft I20, and trip rod I23 in a direction to depress the outer endofsaid arm and to hold the lower end 6 of the trip rod toward the stem9| of the actuator valve 92.

Referring particularly to Figs. 3 and 4, I30 de-s notes a pump,desirably of the gear type,.that is walls 31 and 38, and are fastened tosaid lugs byscrews I40. The pump bracket and parts sustained thereby areomitted from Fig. 5 in order to avoid confusion. Thepulley I 31 is inthe horizontal plane of the previously mentioned pulley 48 that isfastened to the top of the drill spindle 45, and an endless belt I42extends about said pulleys.

Connected to the inlet side of the pump I30, through an elbow fittingI45, is a pipe I46 that depends to within a suitable distance of thebottom wall 36 of the machine head 35 (Fig. 4). A T fitting I41 has itslateral branch connected to the outlet of the pump and its cross brancharranged in a vertical position. The upper end of said cross branchcommunicates, through a, pipe I5, with the previously mentioned fittingI03 that is connected to the upper end of the valve stem 6!. Aconventional pressure-relief valve I52 is connected to the lower end ofthe cross branch of the T fitting I01 and includes a valve closingspring pre-loaded to a given pressure, as will be readily understood bythose acquainted with this class of article.

A prime mover in the form of an electric motor I55 is supported by thehead 35 through the medium of brackets J56. Said brackets include studsI51 that extend forwardly through bores in lugs I50, shown as integralwith and extending laterally from the rear end of the head 35. The"studs I51 are adapted to be secured in any position of adjustment withinthe lugs I58 by set screws I59. shaft I60 vertical, and attached to. theshaft directly above the casing of the motor is a flywheel I6I, anddisposed above the fly wheel and fixed with respect to the shaft is apulley I62. An endless belt I63 is engaged about the pulley I62 andabout the previously mentioned .pulley 41 that is fastened to the drillspindle 45. Obviously, the tension of the belt I63 may be changed byshifting the motor through the adjustment of its supporting bracketsI56.

To prevent leakage or seepage about the piston 62, the wall of thecylinder bore is formed with annular grooves I65 and I66. disposed insuitably spaced relation to each other and to the top of the cylindercasing; and a so-called O-ring I61 (an item well known in the art)occupies the groove I65 and is contracted, through its own resiliency,about the piston 62, and a wiper ring I68 of felt or the like occupiesthe groove I66.

As a result of the manufacturing method ems ployed, an opening I10,produced by a core sup-'- port, opens through the bottom of the head 35;in line with the bore of the cylinder casing 60,"

and this is permanently closed by a'sealed-in plug I1I and similarly, aplug I12 permanently closes the outer end of the passage 90. A drainopening for the reservoir constituted of the head 35 is closed by aremovable screw plug I13.

The motor I55 is arranged with its A section-a1. cover-may, if desired,be applied to the open top of the machine head 35,such a coverbeingindicat'ed-in broken lines in Figs. 4

5, where the cover. is designated I I4.

Themotor' I55, with'a switch I15, is included in-an' electric circuit(not shown) In the present instance, said switch is carried by thepanel2 and is located'beneath thc'right hand side of the table where it isinconvenient reach of the operator.

'Ahollow drill I'Ifi (Figs. 1 and 2) is connected, bymeans of the chuck53, to the lower end of the spindle 45; Irll is the usual stripperplate, carried'by the lower end of a rod I'ii that is recipro'cable inthe bore of a vertical boss I19, shown. as an integral part of the head35. A helical spring mil-surrounds the rod I18 and is compressed betweenthe stripper plate and the bottom of the boss I19, all of this being inaccordance with common practice.

A: guard I 85, shown only in Fig. 1, anddesirably fabricated of sheetmetal, covers the machine head*"and encloses the motor I55 and thecolumn 22".

To condition the machine for use, the reservoir provided by the head- 35is filled with oil or other suitable liquid to-approximately the depthindicated at X in Figs. land 5.

The machine is set in operation by closing the switch" I15 thereby tosupply current to'the motor 155. With' the motor in operation, the drillspindle-" will be rotated through the driving connections constituted ofthe pulleys ll and I52 and the belt I53. With the drill spindlerotatingsimiiar motion will be transmitted to the drive shaft I35 of thepump I30 through the pulleys 43 and I3? and the belt M2. Operation ofthe pump I39 will set up a circulation of liquid .from the reservoirinwardly through the pipe M5, through the pump, and thence through thepipe I to the valve stem BI. With the valve memher' 9'! held in elevatedposition by the spring 93, the liquid will escape through the reliefports 96 to the reservoir, it being understood, of course,

that under the present conditions a quiescent bodyof liquid occupies thelower portion of the bore of the valve stem, the passage 93, and thebore of the cylinder casing 69.

With a stack of paper sheets positioned on the table 24 for drilling,and the stripper plate IT! 0 held firmly in engagement therewith by thespring I80, the operator initiates a drilling cycle by depressingthepedal I0. When the pedal is depressed it draws the pull wire I03downwardly and, with it, the sleeve I30. This movement of the sleeve istransmitted to the valve member 9? through the trip rod I23. When thevalve member is-lowered in oppositionto the spring 98 it closes therelief ports 96 and causes the liquid from the pump to pass downwardlythe length of the valve stem and through the orifice of the plug 94 andthence through the passage 9-3 to the cylinder bore. Acting against thestationary piston 62, the accumulating liquid under pump pressure forcesthe head 35 downwardly so as to project the rotating drill I16 throughthe stack of paper sheets on the table 24. In a normal cycle ofoperation the head will continue to deso-end until the drill haspenetrated the bottom sheet, at which instant the trip rod I23 will bewithdrawn from the upper end of the valve member 31 due to engagement ofthe trip arm I26 with the stop I5. Thereupon, the spring 93 will liftthe valve member 31 above the ports 96, permitting the liquid from thepump, as well as that from: the bore of the cylinder casing 60.,torescape tothe reservoir. Under these conditions, the spring 88 returnsthe-head. 35 to elevated position. However, the-flow of liquid fromthebore of'the cylinder casing is-retarded by therestricted orifice ofthe plug 94, thereby to control. the return speed of the head and enableits upward movement to be arrested by engagement. of the cushion 86-with the nut I4, without shock.

If, for any reason, the operator desires-to stop the drilling operationbefore the drill has com pleted its work, he may do so by releasing thepedal I0. This allows the spring I05 to return the valve trippingmechanism to initial position, and permits the valve member 91 to belifted. by thespring 98 so as to uncover the relief. ports 96.

In case the drill becomes stuck so as to'sto'p rotation of the drill.spindle, thepump will also be stopped inasmuch as it is driven by saidspindle, and further depression of-the head will be prevented. Underthese conditions the operator may immediately open the motor circuit atthe switch I15. Again, should the descent of the head be obstructed fromany cause, undue liquid pressure is prevented from building up in thesystem by the opening of the relief valve I52.

Having thus described my invention, what I claim is:

1. In a machine of the class described, characterized by an assemblycomprising a base, a work supporting table, and guide means fixed to thebase and rising therefrom a substantial distance above the plane of thetable; a head sustained by said guide means above the table for movementtoward and from the latter. biasing means for elevating the head andtending to retain the head in elevated position, power meansincorporated in the head for depressing the head and including a pistonand a cylinder of which one is connected to saidguidemeans and the otherto the head, the cylinder having an open end through which thepistonextends and the piston having a single working face exposed to theinterior of the cylinder, a pump also included in said power means fordelivering fluid pressure to said. cylinder, means operable at willforcontrolling the delivery of said-fluid, a prime mover mountedon thehead thatisin continual operation while the machine isin use, andconstantly effective driving connections between the prime mover and thepump.

2. In a machine of the class described, characterized by a base, a worksupporting table, and guide means fixed to the base and rising therefroma substantial distance above the plane of the table; a head sustained bysaid guide means above the table for movement toward and from thelatter, biasing means for elevating the head and tending to retain thehead in elevated position, hydraulic means incorporated in the head andincluding a piston connected at its upper end to the said guide means inparallel relation thereto, an open end cylinder incorporated in the headand wherein said piston operates, the piston having a single workingface exposed to the intericr of the cylinder, the head being constructedto provide a reservoir for liquid, a pump carried by the head and havingits inlet in communication with the liquid space of said reservoir,communicative connections between the outlet of the pump and saidcylinder, a valve in said communicative connections which, when open,permits the escape of the liquid from said communicative connections tothe reservoir, means biasing said valve toward open position, manual- 91y operated means for closing said valve, a prime mover mounted on thehead, and driving connections through which the prime mover operatessaid pump.

3. In a machine of the class described, characterized by a base, a worksupporting table, and guide means fixed to the base and rising therefroma substantialdistance above the plane of the table, a head sustained bysaid guide means above the table for movement toward and from thelatter, biasing means for elevating the head and tending to retain thehead in elevated position, the head being constructed to provide aliquid reservoir, a cylinder incorporated in the head having its axisparallel to the path of movementv of the head and opening through thetop of the head, a piston within the cylinder having a part extendingabove the latter, a beam connecting said part of the piston rigidly tosaid guide means, the piston having a single working .face exposed tothe interior of the cylinder, a pump carried by the head and having itsinlet in communication with the liquid space of the reservoir,communicative connections between the outlet of the pump and thecylinder, a valve in said communicative connections which, when open,permits the escape of liquid from said connections to the reservoir,means biasing the valve 'to open position, manually operated means for Iclosing the valve, trip mechanism for rendering saidmanually' operatedmeans ineffective when the head reaches the bottom of its stroke, aprimemover mounted on the head, and driving connections through which saidprime mover operates the pump.

4. In a machine of the class described, characterized by abase, a worksupporting table, and guide means fixed to the base and rising therefroma substantial distance above the plane of the table; a head sustained bysaid guide means above the table for-movement toward and from thelatter, biasing means for elevating the head and tending to retain thehead in elevated position, a source of liquid supply in the head, apiston and a cylinder of which one is connected to said guide means, andthe other to the head and so arranged as to depress the head when liquidunder pressure is supplied to the cylinder, the cylinder having an openend through which the piston extends and the piston having a singleworking face exposed to the interior of the cylinder, a pump carried bythe head and having its inlet in communicative connection with theliquid supply, communicative connections between the outlet of the pumpand the cylinder, a valve in said connections which, when open, permitsthe escape of liquid from said communicative connections to said sourceof liquid supply, means biasing the valve to open position, manual meansfor closing the valve, trip mechanism for rendering the manual meansineffective when the head reaches the bottom of its stroke, saidmechanism including a stop disposed in a given relation to the guidemeans, and a trip arm movable with the head for engagement with saidstop, a prime mover mounted on the head, and driving connections throughwhich said prime mover operates the pump.

5. In a machine of the class described, characterized by a base, a worksupporting table, and guide means fixed to the base and rising therefroma substantial distancse above the plane of the table; a head sustainedby said guide means above the table for movement toward and from thelatter, biasing means for elevating the head and tending to retain thehead in elevated posi- .10 tion, a ,piston and a cylinder of which oneis connected to said guide means and the other to the head and soarranged as to depress the head when liquidunder pressure is supplied tothe cylinder, an actuator valve including a tubular stem having a reliefport intermediate its ends, and a sleeve-like valve member reciprocableon said stem between a first position in which it uncovers said reliefport and a second position wherein it overlies and closes the reliefport, the head being formed to provide a liquid reservoir, a pumpcarried by the head and having its inlet in communication with theliquid space of the reservoir, communicative connections between theoutlet of the pump and the cylinder and including the aforesaid valvestem, the relief port of said valve being arranged to discharge into thereservoir, means tending to move the valve member to the aforesaid firstposition, manually operated means for moving the member to secendposition, a prime mover mounted on the head, and driving connectionsthrough which i said prime mover operates the pump.

6. In a machine of the class described, characterized by a base, a worksupporting table, and

.guide means fixed to the base and rising therefrom a substantialdistance above the plane of the table; a head sustained by said guidemeans above the table for movement toward and from the latter, biasingmeans for elevating the head and tending to retain the head in elevatedposition, a piston and a cylinder of which one is connected to saidguide means and the other to the head and so arranged as to depress thehead when liquid under pressure is supplied to the cylinder, an actuatorvalve including a tubular stem having a relief port intermediate itsends, and a sleeve-like valve member reciprocable onsaid stem between afirst position in which it uncovers said port and a second positionwherein itoverlies and closes the port, the head being formed to providea liquid reservoir, a pump carried by the head and having its inlet incommunication with the liquid space of the reservoir, communicativeconnections between the outlet of the pump and the cylinder andincluding the aforesaid valve stem, said relief port being arranged todischarge into the reservoir, means tending to move the valve member tothe aforesaid first position, and manually operated means for moving themember to second position, the valve stem being arranged substantiallyparallel to the path of movement of the head, and said manually operatedmeans including an element movable longitudinally of the valve stem, arocking structure having pivotal connection with said element andincluding a trip rod for engagement with the valve member so as toimpart thereto the movement of said element, said rocking structure alsoincorporating a trip arm that extends laterally from said element, astop in fixed relation to the guide means for engagement by said triparm when the head reaches the bottom of its stroke, a prime niovermounted on the head, and driving connections through which said primemover operates pump.

'7. In a machine of the class described, a head, stationary guide meansby which the head is supported for reciprocation in a verticaldirection, biasing means for elevating the head and tending to retainthe head in elevated position, hydraulic means incorporated in the headfor depressing it, a liquid supply carried by the head, a pump supportedby the head and having its inlet in communication with said liquidsupply, communicative connections between the outlet of,the:pumpandsaidliydrauIlc means, a valve in said connections which, when open,permits return of the liquid .to the liquid supply and, when-closed,diverts the liquid to said hydraulic means, means biasing the valve toopen position, meansfor closing the valve, trip mechanism for effectingthe opening of the valve, said mechanism being movable with the head andincluding atrlp arm, a stop adjustable with respect to said guide :meansfor limiting the upward movement of the head, and'a secondstop in fixedrelation to'the'first mentioned stop and adjustable therewith, thesecondstop being arranged for engagement by said 'trip'arm when the headarrives at the bottom of its stroke, aprime mover, and drivingconnections between the prime mover and 8: In amachine of the classdescribed, a head, stationary guide means by which the head is supportedfor reciprocation'in a vertical direction, biasing means for elevatingthe head and tending to retain the head in elevated position, hydraulicmeans incorporatedin the head for depressing it, a liquid supply carriedby the head, apump'supported by the headand having its inlet incommunication with said liquid supply, communicative connections betweenthe outlet of the pump and said hydraulic means, a valve in'saidconnections which, when open, permits return ofthe liquid to the liquidsupply and, when closed, diverts the liquid to said hydraulic means,means biasing the valve to open position, means 'for closing the valve,trip mechanism for efiecting the opening of the valve, said mechanismbeing movable with thehead and including a "trip arm,-a partof thestationary guide means having a threaded aperture, a screw adjustabletherein and-incorporating a stop for limiting the upward movement of thehead, a'second stop carried by the screw in fixed relation to the formerstop and arranged for engagement by said trip arm when the head arrivesat the bottom of its stroke, holding meanslin .the aforesaid partfrictionally engaging the screw, a prime mover, and driving connectionsbetween the prime mover and the pump.

9. In a machine of the classdescribed, a base, a work supporting table,guide means rising from the base a substantial distance above the planeof the table, a head sustained by said guide means for movement towardand from the table, power means incorporated in the head for moving thelatter, anactuator carried by the head for controlling the operation ofsaid power means, an operating member located in a given positionrelative to the base, and constantly efiective operative connectionsbetween said operating member and the actuatorthat yield to the relativemovement between the head and base.

" JOSEPH ADRIAN.

REFERENCES CITED The following references are of record in. the file ofthis patent;

UNITED STATES PATENTS Number Name Date 613 041 Kamerer Oct. 25, 18981,223,741 Schwister Apr. 24, 1917 1,331,960 Johnson Feb. 24, 19201,353,244 Joerns Sept. 21, 1920 2,023,842 Kingsbury Dec. 10, 19352,072,481 McNairy Mar. 2,' 1937 2,170 702 Wardwell, Jr Aug. 22, 1939 2178,364 Svenson Oct. 31, 1939 2,254,708 Nye Sept. 2, 1941 2,260,327McKee Oct. 28, 1941 2,356,046 Garlick Aug. 15, 1944 2,363,255 Lee et a1.NOV. 21, 1944 2,374,774 Olsen May 1, 1945 2,475,304 Bariffi n, July 5,1949 2,496,431 Bertonneau Feb. 7, 19

